Safety device for looms for weaving tufted pile fabrics



Jn- 19, 1954 E. S. BUTLER ETAL SAFETY-DEVICE FOR LOOMS FOR WEAVING TUF'TED PILE FABRICS 4 Sheets-SheefI 1 Filed March 16,. 1950 .Jail-19,1954 E. sjBu-rLER ETAL SAFETY DEVICE FOR LOOMS FOR WEAVING TUFTED PILE FABRICS 4 Sheets-Sheet 2 Filed March 16. 1950 5 r 2 mi wf W um d r i Jan. 19, 1954 6 E. s. BUTLER ETAL 2,666,458

l SAFETY'DEVICE FOR LOOMS FOR WEAVING TUFTED PILE FABRICS Filed March 16; 195o 4 sheets-sheet 5 Algar Safe?? e fr Tflle/frwz/ff/n- Jan. 19, 1954 E. s. BUTLER ETAL Patented Jan. 19, t1954 f 1'2' SAFETY DEYUICE. FYQB, LOOMS B9B 'BUETED PILE FABRICS Edward si.- Butler; oiu'uiiierron,`V` Oldham; ami Sutcliffe, Wernethi- Oldham; England, assignorsito? Blatty Brothers andy Companyr Limted, Oldham, England pplicatibxrMarch' 16, 1950, SeriafNo. 115301094' Glaims priority; application; Great Britain March 19, 1949 ThisY invention relating. to safety devices for loonl'sl for. 'weaving 'tufted pile fabrics refers to spool Axinins'ter carpet looms and' more particularly tothe transferring mechanism by which tube frames carrying spools of tuft yarn to be inserted between warp threads are disengaged fromVr the carryinggchains and carried to the place where 'the tube frames are caused'. to inisert tuft, yarn. vbetween. the warp threads and` are subsequently restored to the carrying chains.

rlhe present' invention has. f`or its object the provision of'mea'n's f'or preventing the looin' from being run when there is not 'a tube frame inthe transferring arms, 'i. el., 'when for any' reason the tube. frame. is not incorrect position to be taken fromL the vchains or has 'subsequently fallen from the cl'asping mechanism.

The invention provides. tube frame transferring mechanismA for looms' for 'Weaving ltufted pile fabric in whichone ofthetiansferring arms' forn'rs one lContact" terminal in', al loW'-'i`fo'ltage electrical circuit of electridstop motion inea-ns;r the other contact ofl which`v provided' Von 'an insulated bracket on A the. transferring shaft andv comprises a metal` platej insulated'. from 'said'.

bracket andv furnished*v with. an adjustable screw' terminal projecting into` the" path' of' movementV only so much of a loom isr showni asis necessary" for-a clear understanding of tneinvention.. n Referrin'gto-tlie drawings Fig?. I is ka. plan" 'of the transferring mechanismofal` sp'oolfAXmjinster carpet loomL embodying they invent-ien; Figi la isy a fragmentary: sectional view: throughtheline Xi-X'of Fig. 1i; Fig.' Z'fisL-a' se'i'itibnal`I sidel View through; the=1ne IIf-.II ojf' Fig. '1;"F'igi l isafragmentary plan and Figi`v 49a; fragmentary side view of the left-hand upperl part-1 'of' Fig. l, drawnitiotaplargeriscaleiandsnowing 'electrical Contact platei laten t bei describ'ed; 5' is -a-`v clasping; oamimech'anismi `Eig.M 6i the electricali circuiti. of thin'elettrici steph motion;

Figs; 7: andz are:diagrarnrnaticrj viewssotai-detail? part, later: toi be described.

' same:- refenenoe characters iiidii'ratel corv the sevef'all figures; of? 'theT responding' parts drawings. f

yRefeinzig' to the drawings fue., lnb 'indicates pail? 0f transferring arms eharig at its forward: extremity 'a clasping bracket fi for en. gagin'ga tube frame Tan'd each pii'fote'd approxi'- mately midway' of their'length4 on 'a' pivot stud' r2' carried in. a bracket' I3v integral' with a transferring shaft fd extending across the full width of the loom and carried' at'opi'oosite'A ends in bearing' brackets, not' shown. 'secured to' 'the loom frame;

. Eachpair of transferring arms" is inter-com nected by'a linkage lfinfsuch a inanner'that the transferring arms may" be caused to move towards 'or' away from one Aanother when one" of the transferring arms; i. e. liliIt is moved by'a vertically disposed' cam |16' in the Working of: theA loom, in known manner".V n

The means' by which the'clasping rody cafn IE, on a rod It, is' maintained against" the arm I'f is` shown in' Fig'. '5" iITWhi'ch 2'] indlcate's'ei b'0`v71` o1" roller mounted at one-'end of a lever' Zta" pive' ote'd in a'A bracket Z'IW'on the loom frame; Con--4 nected tothe opposite 'endE of the lever 21a* isn arod- 2I"slid'ab1y' supported at its opposite en'd in a part of thefloom'- frame; vlitfrung 'on the rod illG4 a tensionl spring' Il, andI opposing forcei is1 ap; plied to thecan'r I'Bby the'compre'ssion spring 21d through the lever 2145* and bow-l 21|'. The load imposed ony the ends' 'ofLvv the"- tube framesl by4 the clasps l l at the forward ends of 'thetiansferringy arms may be regulated by adjustingthe:` link motion llasdesiredl A- projection or bracket 18"' forming part ofthetransferring shaftll is furnisl'ied'l adjacent toits rear with anV electrical contact terminal; the terminal* being insulated from: the loom;

The contact' terminary is' in the1 form; ofA an adi-'- justable screw ISmounted a;Y plateZDs'ecured' to; but insulated from? the bracket' rai 'The` plaie zo is; secured to` traera:A ls iiy screws 2lia passing through" insulating bushes" 281 tted into the pI'atefZ'Uf apiece" ofnsulating material 2UAbeing insertedlbetween theplate- 20 and theebracket i8; 'as slowrn in Fig. 31. The electric lead toit-hef pllateZll'l is-'indicated at' 2l).

The terminal is in a llow voltage electrical circuit embodying a relayWK connection withr` the starter f o'f theL electrrnotbr:

The insulated terminal I9 forms one contact while the other contact is formed by the transferring arm |02.

When a tube frame is properly held in the clasps Il at the forward end of the transferring arms the electrical contact I9 cannot be engaged by the arm IL and the loom continues to run.

When a tube frame is transferred from the transferring arms to the carrier chains the forward ends of arms IBEL and IIIb are moved outwardly in opposite directions about their respective pivots I2 and during the time taken by the carrying chains to move from one position to the next position to bring a fresh tube frame into position for removal the contact I9 remains unengaged by arm Ia and the loom continues to run.

The aforesaid outward movement of the transferring arms is brought about by known mechanism shown in Figs. 1 and 5, in which the clasping rod cam i6, secured to the rod |62, bears against a projection Ib on the rearward portion of the transferring arm |02. mentioned parts are in the positions shown in Fig. 5, the clasping means I I are in the positions When the afore- Y shown in Fig. 1, i. e., in the positions where they are holding the tube frame T.

When it is desired to unclasp the tube frame T the rod |62 is moved downwardly (as viewed in Fig. 5) so that the projection Iiib on the rearward end of the transferring arm Il)a is moved into contact with the part IBC under the influence of the spring Il, This has the effect of bringing the rearward portions of the transferring arms towards each other, thereby moving the clasping means I I outwardly.

The spring 2id, as shown in Fig. 5, exerts a constant pressure on the rearward end of the transferring arm Illa which tends to force the clasping means II inwardly. When the several parts of the mechanism are in the positions shown in Figs. 1 and 5, the pressure of the spring 2 Id is resisted by the tube frame T and the portion I0 of arm IIJ#l is held away from the aforesaid electrical contact I9. But if the tube frame T is not in the correct position to be received by the clasping means Il, or if it should fall from the said means, the spring 2|d acts to move the rearward portion I0' of the transferring arm Illa through an additional distance that is sufficient to cause the rearward portion I0 of the arm Illa to come into abutment with the contact terminal I9, see chain dotted lines in Fig. 3, to close the said low voltage electrical circuit and bring the stop motion means into operation.

The sequence of operations of the electric stop motion will be described with reference to the diagram shown in Fig. 6 in which B indicates a transformer for low voltage; C indicates a trip relay with one normally closed contact indicated at C1; D indicates a relay with two normally open contacts D1, D2; E indicates a trip contact on the loom provided by the screw terminal I9 and the transferring arm Illa; F indicates a change-over push unit actuated by the loom starting handle, having four terminals F1, F2, F3 and F4; G indicates a reset button on the loom; H indicates a signal lamp.

The operation is as follows:

With the loom running normally, all the contacts and relays are as shown in the diagram, the transferring arms being in the position shown in Fig. 1.

When the transferring arms move towards each other. contact is made between the terminal I9 and the adjacent transferring arm IIIa thereby making contact at E (Fig. 6) and thus energising the relay coil D and closing contacts D1, D2, contact D1, providing van alternate path for electric current through the relay coil D, making the relay coil D self-retaining and now independ ent of the contact at E. The contact D2 being closed provides a circuit through the contacts F1, F2 and relay coil C, thus breaking contact C1 whichy causes the circuit to the electromotor to be opened automatically, and de-energises a solenoid on the loom, whereby to trip the starting handle.

The starting handle, which is spring-loaded, thus returns to the off position and in so doing releases the clutch between the electromotor and the loom and applies a mechanical brake, at the same time also releasing the change-over push unit F, breaking contact between F1 and F2 and bridging F3 and F4.

The relay coil `C is now de-energised and C1 returns to normal closed position. An alternative circuit then ows through contacts F3, F4, lamp H and contact D1, thus indicating the cause of the stoppage.

n The driving motor can be switched on if required and the loom inched at the operators will, but, if the starting handle is moved to full on position before removal of the causes of stoppage, the stop motion will again act.

Having rectified the cause of the stoppage, the operator can then press the re-set 'button G, and the loom is again ready for running.

The means for moving the starting handle quickly from on position to off position are shown diagrammatically in Figs. 7 and 8.

Referring to Figs. 7 and 8, 22 indicates the starting handle shown in the on position in a notch 23a in a quadrant 23see Fig. 8. 24 indicates a solenoid carried in suitable position on the loom; connected by a swivel 25 to the core 26 of the solenoid 24 is a bell-crank lever 27, the opposite end of which is connected to an adjustable connecting rod 28. The connecting rod 28 is connected at its opposite end by a lever 29 to a knock-off lever 39 pivoted on the same shaft 3| as the lever 29, the free end of the knock-off lever 3G lying adjacent to the starting handle 22 when in the on position. yWhen the stop motion is actuated as previously described, the solenoid 24 is de-energised, whereupon the core 26 drops and through the link 25 rocks the bellcrank lever 27 which in turn pushes the connecting rod in the direction of the arrow Y to rock the lever 29 and with it the knock-off lever 30 which, moving quickly forward under the iniluence of a spring 32 in operative association with the connecting rod 28, knocks the starting handle 22 out of the notch 23e.

The starting handle 22 which is spring-influenced moves rapidlyto the off position and releases the driving clutch between the electromotor and the loom and applies a brake to bring the loom to a standstill.

What we claim is:

1. In spool Axminster carpet looms embodying an electromotor, a clutch, a starting handle, a brake, electric stop motion means embodying a low-voltage circuit, transferring mechanism for tube frames of the loom embodying a pair of transferring arms mounted on a transferring shaft, clasping means attached to the forward ends of said transferring arms and spring means y for urging the forward ends of the transferring arms towards each other when there is not a tube frame in the clamping means, an electric stop motion means for the loom including a low voltage electric circuit having a pair of contact terminals, one of said transferring arms forming one of said contact terminals in the low-voltage electrical circuit of said electric stop motion means, the other contact terminal of which is carried on a bracket on the transferring shaft and comprises a metal plate, an insulation block interposed between said plate and said bracket, screws screwing through insulation bushes in said metal plate to secure the plate to the bracket and an adjustable screw terminal on said plate projecting into the path of movement of said one transferring arm forming one of said contact terminals, whereby when said transferring arm contacts with said screw terminal the low-voltage circuit is energized and the electric Y stop motion means is brought into action to stop the loom or to prevent the loom from being run when there is not a tube frame in the transferring arms.

2.' Mechanism as claimed in claim 1, in which ,the electric stop motion means embodying a lowtransferring arms mounted on a transferring shaft, clasping means attached to the forward ends of said transferring arms and spring means for urging the forward ends of the transferring arms towards each other when there is not a tube frame in the clasping means, the improvement comprising an electric stop motion means for the loom including a low-voltage electric circuit having a pair of contact terminals adapted to be energized for putting the Vstop motion means into operation, one of said transferring arms forming one of said contact terminals in the lowvoltage electric circuit of the stop motion means, the other contact terminal of said circuit being carried on the loom and insulated therefrom, said other contact terminal being located in the path of movement of said one transferring arm forming one of said contact terminals when a tube frame is not in the clasping means of the arms, whereby said one transferring arm is adapted to engage said other contact terminal and energize the low-voltage electrical circuit to stop the loom when there is not a tube frame in the clasping means of the transferring arms.

E. S. BUTLER. ARTHUR SUTCLIFFE.

References Cited in the file of this patent UNITED STATES PATENTS Number Name Date 1,973,653 Penman et a1. Sept. 11, 1934 1,973,655 Penman et al Sept. 11, 1934 2,306,280 Robb Dec. 22, 1942 2,306,303 Dacey Dec. 22, 1942. 

